Saw stretcher



- J. H. GREEN June 16, 1931.

SAW STRETGHER Filed July 10, 1929 z w 9 5 W m, we M M n 7/14}? V/I/AI 9 M m m U M m ,m w In, n H WC T H IIIMII,

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' sirableto use a I be readily un -man;sTArrasa PATENT? oFEIcEy a This invention relates to saws, and more particularly to a saw blade holder and stretcher for saws in .which it is desired to readily remove and replace the blade such as hack saws and butcher saws.

' As is well known, it is desinblein-hack saws and butcher saws to have the blade readily removable and replaceable, not only because of the ease with which such blades are broken, but also because it is often deblade with a different edge for various kinds of work, and further it is often necessary to make such blade and frame easily cleanable for sanitary purposes, and it is an object of this invention to provide a saw blade holder and stretcher which may be readily and easily released and relocked, which will hold the blade firmly and securely under-tension and willalso hold such blade against twisting in use, thereby reducingits tendency to snap. and break and giving better' operation; as it is always held in proper position.

It is a further object of this invention to provide a blade holder and stretcher which not only permits the blade to be easily removable for cleaning, but'which itself may and easily cleaned.

ltis an additional object of this invention 1 features of construction and to provide a blade holder and stretcher which may be used to release and relock the blade without necessity of the use of any tools, which will hold the blade positively, yet may be released and relocked in an instant even by a person of less than average strength.

stretcher in released or unlocked position.

Fig. 4 is a sectional view on the line 4-4 of Fig.2..

consists. in certain novel JAMES H. GREEN, or s'rna'rronn, .connnc'rrcn'r saw 's'rnEuicEEn Application filed July 10, 1929.. Serial No. 377,208.

' Fig. 5 is a sectional view on the. line 5'5 of Fig. 2,. and 1 i Fig. .6is a top plan view of the hooked locking lever.

In the drawings represents a saw frame of inverted U-sha'pe and .11 a handle of the type commonly usedas-hack or butcher saws. I

A blade 12 is attached thereto at one end 13 inany suitable manner.-- To the other end of the frame 10 isattached a block 14 having a notch 15 in one end thereof to receive the end of the frameand is secured thereto by a bolt 16. Slidable in .a channel 17 in the other end of block 14 is a link 18 having a bladereceiving pin 19 at one end thereof. A groove 20 extending partway in the channel permits the pin to enter within the channel, and the channel is of greater width than the thickness of 'thelink'18 by the thickness of a conventional saw blade 12, so that the end of the blade 12 maybe placed over pin 19 and then be drawn into channel 17 and the link and the blade will just'fill the channel. Hence,' the link 18 on one side on the blade 12 and the side ofthe channel 17 on the other side of the blade cooperate to hold the blade against twisting in use. I

" lVhen pin 19 has been drawn into. the

' groove 20, the blade is locked in place by the I sides of the link andchannel, and the means for drawing the pin into the groove com prises a lever 21 pivoted off center to the link as at 22." This lever 21 has'a cam surface 23 1 between pivot 22 and the block ending in a flat 24,so that when the lever is turned onits ivot the cam surface 23 abuts against the block 14 and draws .the link'18 through the channel, hence drawing the end of blade 12 into the channel and placing it under tension.- To hold the lever in locked. position the lever is swung until the fiat 24 abuts block"14, whereupon the lever is held in locked position'until it is swung in the opposite direction about pivot 22. The other endof lever 21 is formed into a hook 25 of such curvature and length that it will just abut against block 14 when the fiat 24 abuts the I block, dental release, tional release of thelever.

thus protecting the lever against accias well as facilitating inten-v table or other easily turned even by a person of less than.

When it is desired to place a blade in position, the parts are in the position shown in Fig. 3, the blade 12 having just been placed with its end over pin 19 and alongside the link 18. To draw the block into the'channel, whereby to hold it firmly under tension and against twisting or turning laterally in use, the lever 21 is turned about the pivot 22. As the lever is turned, the cam 23 abuts against the edge of block 14, drawing the link 18 and blade 12 into channel 17. If neeessary, the lever 21 may be placed on a floor, supporting surface, and thus average strength, until flat 24 abuts the edge ofthe block and at the same time the en of hook 25 will also abut the block. The action of flat 24 against the block looks it in place. I

To release the blade, either to replace it or to clean it, it is only necessary to turn lever 21 in the oppositedirection, which may be done by hand orby merely placing hook 25 over a nail on the Wall or a butcher hook and drawing the frame 10 downwardly whereupon the leverwill pivot and the blade will be released. It will be notedalso, that all the parts of this device are easily cleanable when in released position, and that the blade may be removed and replaced even by a child. I

Having thus set forth the naturevof my invention, what I claim is:

1. A sawjstretcher and holder comprising a substantially U-shaped frame, a handle secured to said frame and so located that one end of the frame projects beyond the handle, a blocksecured to said projecting end of the frame and adapted to closely fit said end with the forward edge of the latter flush with the face of the block, the upper face of I the block flatly abutting the handle so as to I. a pin on said link end of a saw blade, said channel at one end afford no crevices between the block, U- frame. and handle, a blade secured to the other end of the frame, and means on the block for drawing the blade tight.

2. A saw stretcher and holder comprising a frame, a handle secured to said frame near one of itsends, a block having an L-shaped notch receiving the end portion of the frame and against the end of which the end of the frame abuts with the end of the block abutting the handle and the front edge of the frame flush with the face of the block, a securing means passing through the block and end portion of the frame, and means on the block for anchoring the end of the saw blade. 3. A saw stretcher and holder comprising a block attached to one end of a saw frame, said block "having a rectangular shaped channel therethrough, a link in said channel, for the attachment of one beingof a width'and height to snugly but shdablyreceive the link, said channel at its other end being of a width and height to snugly receive thelink and the end portion of a saw blade on said pin, said channel having a groove in its wall at the end of extra 

